Improvement in turning-lathes



S.D.SHELD-O N.

TURNING LATHE.

N0. 141z,9'71. Patented Mar. 21, 1871.

mz z'veiss es 1 a cat.

SAMUEL D. SHELDON,OF FITOHBURG, MASSACHUSETTS.

Letters Patent no. 112,971, dated March 21, 1871.

IMPROVEMENT .lN TURNlNG-LA'l'l-IES.

The ScheduIe referred to in these Letters Patent and making part of thesame.

To all whom it may concern:

Be it known that I, SAMUEL D. Snnnnon, of

'Fitchburg, in the county of Worcester-and-State of,

Massachusetts, have invented certain new and useful Improvements inLathes; and I do hereby declare the following to be a full, clear, andexact description of the same, reference being had to the accompanyingdrawing, which represents. a front view of so much of a lathe as isnecessary to illustrate my invention.

"I: enable those skilled in the art to which my invention belongs tomake and use the same, I will proceed to describeit more in detail- Thenature of my invention consists in the combination, with the spindle ofa lathe or chuck, of a movable cone-pulley, a-friction-plate, anoperatinglever, and a stoppingebrake, as hereinafter described.

In tliedrawing- A indicates the supporting-frame;

B indicates the head-block;

(l indicates the lathe or chuck-spindle;

' D indicates the pulley-cone; and E, the operating-leverl The lathe orchuck-spindle G is supported in bearings, F, upon the head-block B, andthe pulley-cone D is hung loosely upon said spindle A'loosc collar, G,is arranged on,the small end of the pulley-cone, and projecting pinsi a,at the side of said collar, engage with the upper forked end of theoperating-lever E, whereby the pulley-cone D can be moved to the rightand left to engage or disengage the friction-clutch. device, by means ofwhich the pulley-cone is'locked to the spindle 0, when desired. Theouter rim of the frictionclutch is formed within the large end-of thecone D, as indicated by dotted lines, while the inner rim there'ofds,formed upon a plate or disk, I, which is rigidly secured to the spindle0, between the end of the cone and the right-hand bearing F.

The friction-plate or disk I is provided with an an-- nular flange, J,and a brake, K, isarranged to press up against the underside thereof,for the purpose of stopping the motion of the lathe or chuck-spindlewlieirtlie friction upon the plate or disk I is released. The rod of thebrake K is supported in a vertical position within a lug, L, cast uponthe head-block B, and its lower end is joined, by means of suitable theii'iction-clutch is operated.

"The operating-lever E is fulcrumed between earpieces, N, upon thehead-block B, and its lower end I and for the purposes set forth.

is joined, by a rod, P, orother suitable connection, to a treadle, R, bymeans of which the'levcr E can be actuated to throw in thefriction-clutch and remove the brake K, while a suitable spring, S, isarranged, in connection with the-lever E, for actuating the parts.

in the opposite direction, all of which are indicated in the drawing-I'.It will be observed that, by means of this construction, thecone-pulley D can be kept constantly in motion and when it is desired tostart the spindle O' the operator has only to place his foot upon anddepress the treadle It, when the pulley D will be moved'up to the diskI, and the friction-rims engaging cause the spindle the operator. 1

In the ordinary lathes the belt which runs the counter-shaft requires tobe shipped from the tight to the loose-pulley, and the motion of thespindle after.- ward-stopp'ed by placing the hand uponthe pulleycone.This 'occupies considerable time and is a matter of considerableinconvenience, especially when-the work requiresconsiderable changing.

It will be observed that, with my improvements, this inconvenience anddelay are obviated; therefore it will readily be perceived by thoseskilled in the use of lathes that my improvements are'of great utilityand practical value, inasmuch as no time is lost in shipping the belt orstopping the motion of the spindle, while the operation of the clutchand brake being per-' formed with the foot-the operator has both handsfree, so that he can conveniently attend to any requirementsof the work.

Having described my improvements in lathes,

\Vhat I claim therein as new and of my invention, and desire to secureby Letters Patent, is-

The combination, with the spindle O and movable.

cone-pulley D, of the flanged friction-plate I J, oper-Y.

ating-lever E, and stopping-brake K, substantially as 4 SAMUEL D.SHELDON.

Witnesses:

A. E. Pnrncn, CHAS. H. BURLEIGH.

